Oil pressure gauge not working on 71 Demon rally guages

RedFish said

FIRST MOST IMPORTANT SPOT TO LOOK AT IS
The connector atop that sender. I doubt it has an insulator on it today. If it falls on a ground it can kill other components in the panel.

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This happened all the time on my truck. it'd just fall off. As Redfish said, check that.

Between what Del(67Dart273) and RedFish have said or will say, you are pretty set. They are the resident experts on electrical and dashes.